Direction (18-20): In the following questions, some of the sentences have errors and some have not. Find our which part of the sentence has an error. The number of that part is your answer. If there is no error, your answer is (d).

No sooner did the fisherman Abdul Sattar (a)/ see the bus plunge into the river (b)/ that he immediately rowed his boat to the site and jumped in. (c)/No error (d).